This signs deters people who are not familiar with chemistry to stay out of a Louisville, KY fountain. Everyone in the fountain is either illiterate or has average intelligence. Dummies who can read stay dry.

I actually saw an interview on a local news station when they put those signs up and they asked a guy about them his answer was "I don't know nothing about that but it hasn't hurt me yet." And he was serious!

I don't have a photo, but when I was in Israel in 1999, there was a store having a sale and they had signs everywhere that said "Fuck the Sale". I thought it was pretty funny, especially since so many people there speak English.